What truly makes Liar Liar work, however, is Shadyac's inspired sense of comic proportion. While torquing the hilarities to the max, he never loses sight of the story's important human side. His blend of farce with heart is perfect.
Fletcher Reede is a competent lawyer who has learned that lying is easier and more rewarding than telling the truth. This will change when his son decides to ask as a birthday wish that Dad spend at least a full day without being able to lie. A day that will change Reede's life. Or at least that was the intention of Jim Carrey in this deeply beautiful and touching film, where the laughter mingles with the beauty of the love shown by a father who truly wants to regain his family. The script, by telling a morally edifying story in an effective way, can therefore be considered as one of the strongest points of this film.
Jim Carrey has achieved here one of his most important successes. With it, he became a consecrated comedian. His performance is truly colossal, there isn't a moment where he doesn't shine, completely overshadowing the rest of the cast, with the honorable exception of Justin Cooper, who gives life to the sweet and innocent son of the lawyer. Some of the scenes involving Reede and Max are worthy of humorous anthologies.
Personally, I consider this film as the consecration of Jim Carrey, rather than the most famous and popular "Bruce Allmighty", who came a little after. The story is very simple but beautiful, the cast work was very competent, the direction of Tom Shadyac worked well... basically everything was up to the project. It's not an exceptional film, it's not a timeless work of art. It's a film for familiar entertainment, to see and to laugh. If viewed in this light, it's an excellent film.
This lighthearted comedy could've been so much more. It was painfully cliché, the acting wasn't that good except for Carrey and the movie was way too predictable. It wasn't a ad movie, it was just a disappointing one.